This year thethirdvoice and I have bought each other those Marks & Spencer Christmas Tree calendars with the draws, which we are filling up with little surprises (having first disposed of the chocolates).
What has surprised me is how difficult it actually is to find small cheap things nowadays. More precisely, it has to be able to fit in a space around 1.5" cubed and ideally cost on average around 50p (we discussed this an came to the conclusion that much more would make a fairly expensive advent calendar when you took into account their were 24 drawers).
Anyway, I'm now feeling fairly accomplised, having only one more drawer left to fill. No 4 - as that's the one I've been carrying around the shops with me to check sizes of things.